EP0074939A1 - Plasmaschmelzofen - Google Patents

Plasmaschmelzofen Download PDF

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Publication number
EP0074939A1
EP0074939A1 EP82890110A EP82890110A EP0074939A1 EP 0074939 A1 EP0074939 A1 EP 0074939A1 EP 82890110 A EP82890110 A EP 82890110A EP 82890110 A EP82890110 A EP 82890110A EP 0074939 A1 EP0074939 A1 EP 0074939A1
Authority
EP
European Patent Office
Prior art keywords
furnace
plasma
melting furnace
line
plasma melting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82890110A
Other languages
German (de)
English (en)
French (fr)
Inventor
Helmut Dieter Dr.Dipl.Ing. Kilches
Walter Dr. Dipl.-Ing. Lugschneider
Ernst Riegler
Ernst Zajicek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine AG
Original Assignee
Voestalpine AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voestalpine AG filed Critical Voestalpine AG
Publication of EP0074939A1 publication Critical patent/EP0074939A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/003—Extraction of waste gases, collection of fumes and hoods used therefor of waste gases emanating from an electric arc furnace

Definitions

  • the invention relates to a plasma melting furnace with a lid and a melt container, through the side wall of which plasma torches arranged at an angle to the furnace axis are guided, a main exhaust line equipped with a draft regulator being connected to the cover and a separate discharge line for exhaust gases from other furnace openings being provided.
  • a plasma melting furnace In a plasma melting furnace, an electrical discharge is maintained between the plasma torch (s) connected as the cathode and a bottom electrode or a melt as the anode.
  • the direct current generates a so-called plasma jet and flows in an electrically conductive channel made of ionized gas introduced by the plasma torch.
  • the gas used is preferably nitrogen for the ignition and an inert gas such as argon or mixtures of these gases for the melting process.
  • a protective gas atmosphere is thus simultaneously formed in the interior of the plasma furnace and is to be obtained with the smallest possible additions during the melting process. This is particularly necessary when melting steel grades with low nitrogen contents.
  • a ventilation system for electric arc furnaces is known from AT-PS 295 179, by means of which gases and smoke are to be eliminated and desired atmospheric conditions are to be created in the furnace.
  • Such an arc furnace has two separate leads for the exhaust gases, each lead being equipped with a draft regulator. Furthermore, according to AT-PS 295 179, a selector switch is provided which alternately opens and closes the tension regulators via valves during the periods of melting, on the one hand, and freshening and slagging, on the other. The electrodes are led through the furnace vault, it is not intended to maintain a protective gas atmosphere inside the furnace. With a ventilation system according to AT-PS 295 179, the extraction of the smoke rising from the pouring spout and from the furnace door in particular is only possible to an incomplete degree.
  • the invention has for its object to provide a plasma melting furnace - in particular a plasma primary melting furnace - in which the resulting exhaust gases or reaction gases as well as dust and smoke are effectively removed without polluting the furnace hall or the environment, and in which the protective gas atmosphere inside the furnace during all necessary work processes - for example also during a possible recharge or removal of slag - is certainly maintained.
  • the object is achieved in a plasma melting furnace of the type defined in the introduction in that the separate derivation is designed as a downwardly open channel which is attached peripherally to the outside of the container in the region of the upper edge of the melt container.
  • This channel enables smoke, dust and exhaust gases to be extracted in every phase of the furnace operation, regardless of the position of the draft regulator in the flue gas duct leading away from the opening in the furnace cover.
  • the duct expediently has hood-shaped extensions via the furnace door and pouring spout in order to be able to safely control the exhaust gas outlet from these comparatively large furnace openings even when larger quantities are produced.
  • the duct is preferably connected via a connecting line in the suction direction behind the tension regulator to the exhaust line leading away from the cover. In this way, only one induced draft fan is required; the entire exhaust gases are combined in one line and can be cleaned and dedusted before they are released or are subjected to gas separation for the recovery of protective gas.
  • a line is provided within the discharge channel for the supply of protective gas with bores directed downwards via the furnace door and pouring spout.
  • protective gas can be blown through these holes so that a gas curtain or -curtain is built in front of the two large oven openings.
  • a gas curtain prevents the entry of false air into the furnace interior if a vacuum is briefly created in the furnace, and even enables the furnace door to be opened during melting without the contamination of the melt, for example by oxidation or nitrogen absorption.
  • further holes are possible for the same purpose as above in the line - for example also above the feedthrough openings for the plasma torch.
  • inert gases in particular argon, nitrogen or carbon dioxide, are preferred as protective gases for the gas curtain.
  • Fig. 1 shows a side view
  • Fig. 2 shows a plan view of an embodiment of the plasma melting furnace according to the invention.
  • Fig. 3 and in Fig. 4 details in the area of the furnace door and in the area of the pouring spout are enlarged and shown in section
  • Fig. 5 shows a section of the discharge duct with the connection point for the supply line of protective gas, partly in section.
  • the essentially cylindrical melt container of the plasma melting furnace is designated by 1, on which a water-cooled cover 2 rests.
  • the cover is connected to a cover support structure 3.
  • An exhaust pipe 4 leads away from a suction opening in the cover via a pipe bend.
  • a throttle valve 5 is installed in the exhaust line as a tension regulator.
  • the exhaust pipe 4 is connected to a suction device (suction fan), not shown.
  • suction fan suction fan
  • Discharge channel 6 hood-shaped extensions 9, 10 (ig F. 3 and 4) on; the channel 6 is connected to the exhaust line 4 via a connecting line 11, the connecting line 11 only opening into the exhaust line 4 after the throttle valve 5.
  • a ring line 12 with bores 13 directed downward above the furnace door 7 and the pouring spout 8, which can be supplied with protective gas via the connector 14 (FIG. 5).
  • Three plasma torches denoted by 15 are guided through the side wall of the melt container 1 at an angle to the furnace axis.
  • the plasma torches are movably supported on the supports 16.
  • a lid lifting mechanism 17 and a lid pivoting mechanism 18 are arranged laterally next to the melt vessel 1.
  • the bottom part 19 of the furnace rests with weighing beams 20 on raceways 22 supported on the foundation 21.
  • the bottom electrode 23 passes through the bottom part 19, the power connection is not shown.
  • the exhaust line 4 leading away from the cover 2 of the plasma melting furnace is closed by means of the throttle valve 5.
  • the protective gas reaching the furnace interior through the plasma torch in a known manner remains in the furnace;
  • the air originally contained in the furnace interior and the flue gases generated during melting escape through the furnace openings mentioned and are sucked off via the duct 6, the connecting line 11 and the exhaust line 4 by means of a suction fan.
  • the removal of the gases is facilitated by the hood-shaped extensions or extensions 9 and 10 provided in the area of the furnace door and the pouring spout.
  • the shielding gas flows out through the bores 13 and forms - as already described above - a shielding gas curtain in the region of the furnace door 7 or the pouring spout 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
EP82890110A 1981-09-15 1982-08-02 Plasmaschmelzofen Withdrawn EP0074939A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3980/81 1981-09-15
AT0398081A AT382014B (de) 1981-09-15 1981-09-15 Plasmaschmelzofen

Publications (1)

Publication Number Publication Date
EP0074939A1 true EP0074939A1 (de) 1983-03-23

Family

ID=3558015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82890110A Withdrawn EP0074939A1 (de) 1981-09-15 1982-08-02 Plasmaschmelzofen

Country Status (4)

Country Link
US (1) US4436290A (ja)
EP (1) EP0074939A1 (ja)
JP (1) JPS5862486A (ja)
AT (1) AT382014B (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4918282A (en) * 1986-01-10 1990-04-17 Plasma Energy Corporation Method and apparatus for heating molten steel utilizing a plasma arc torch
US4734551A (en) * 1986-01-10 1988-03-29 Plasma Energy Corporation Method and apparatus for heating molten steel utilizing a plasma arc torch
FR2693261B1 (fr) * 1992-07-06 1994-09-23 Unimetall Sa Four, notamment four électrique, de traitement de métal liquide.
DE10038597C1 (de) * 2000-08-08 2002-03-21 Schott Glas Schmelzwanne mit einem verschließbaren Gemenge-Einlegekanal

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1244051A (fr) * 1958-12-19 1960-10-21 Pangborn Corp Perfectionnement aux hottes pour fours
US3164658A (en) * 1962-08-20 1965-01-05 Yagi Rokuro Apparatus for use in intercepting leakage of fumes and dust from electricarc furnaces
DE1205232B (de) * 1960-02-17 1965-11-18 Von Roll Ag Vorrichtung zur Rauchgasabfuehrung an Elektrooefen
DE1928501A1 (de) * 1968-06-06 1972-03-02 Wheelabrator Corp Ofenkonstruktion und Verfahren zu ihrem Betrieb
DE2213588A1 (de) * 1972-03-21 1973-09-27 Bbc Brown Boveri & Cie Rauchgasabsaugvorrichtung fuer induktions-tiegeloefen
DE2553180A1 (de) * 1975-11-27 1977-06-02 Beth Gmbh Maschf Verfahren und vorrichtung zum abschirmen eines staubhaltigen abgasstromes
DE2703859A1 (de) * 1976-02-02 1977-08-04 Elkem Spigerverket As Vorrichtung zum aufsammeln von abstichgasen bei elektrischen schmelzoefen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1244051A (fr) * 1958-12-19 1960-10-21 Pangborn Corp Perfectionnement aux hottes pour fours
DE1205232B (de) * 1960-02-17 1965-11-18 Von Roll Ag Vorrichtung zur Rauchgasabfuehrung an Elektrooefen
US3164658A (en) * 1962-08-20 1965-01-05 Yagi Rokuro Apparatus for use in intercepting leakage of fumes and dust from electricarc furnaces
DE1928501A1 (de) * 1968-06-06 1972-03-02 Wheelabrator Corp Ofenkonstruktion und Verfahren zu ihrem Betrieb
DE2213588A1 (de) * 1972-03-21 1973-09-27 Bbc Brown Boveri & Cie Rauchgasabsaugvorrichtung fuer induktions-tiegeloefen
DE2553180A1 (de) * 1975-11-27 1977-06-02 Beth Gmbh Maschf Verfahren und vorrichtung zum abschirmen eines staubhaltigen abgasstromes
DE2703859A1 (de) * 1976-02-02 1977-08-04 Elkem Spigerverket As Vorrichtung zum aufsammeln von abstichgasen bei elektrischen schmelzoefen

Also Published As

Publication number Publication date
US4436290A (en) 1984-03-13
ATA398081A (de) 1986-05-15
JPS5862486A (ja) 1983-04-13
AT382014B (de) 1986-12-29

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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17P Request for examination filed

Effective date: 19830409

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19851018

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ZAJICEK, ERNST

Inventor name: LUGSCHNEIDER, WALTER, DR. DIPL.-ING.

Inventor name: RIEGLER, ERNST

Inventor name: KILCHES, HELMUT DIETER, DR.DIPL.ING.